The naked eye identification of the artificial old jade "twilight" can be observed from two aspects:
1. Look at the fracture and ridgeline:
Because the jade material is immersed in the acidic liquid for some time, the surface of the jade material will be seriously corroded, and even the internal structure will undergo slight changes. After the acid corrosion treatment of the jade, the naked eye will find that the boundary of the surface particles is not clear, the gloss of the section is weakened, and the ridge line is not straight. At this time, the dissolution rate of the acid solution is inconsistent due to the composition of the mineral particles.
2. Look at the crack:
After the engraved and polished jade is heated and then rapidly cooled, fine cracks and cracks such as "bovine hair" and "blood vessel" are generated, and then placed in a dye solution with a certain concentration for soaking. Careful observation of the cracks or pits reveals that the color in the crack is enriched, richer than the surrounding color, and there is no excessive change in the inner and outer colors.
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